input / output jack, power supply or 9V battery.
Knob a tone, a level, and distortion.
very standard config.
Black metal casing enough class, buttons inspire confidence.
and the switch.
it all looks very solid!
The distortion is large enough, even set to minimum, it has a lot of gain.
the tona is quite effective.
the sound is pretty hot and rather slimy.
I love the blues for nasty stuff or more noisy.
Compared to distos boss is a lot better in my opinion.
for this price is unbeatable.